Vegetable hit back in strip cartoon (7)
I believe the answer is:
peanuts
'strip cartoon' is the definition.
'vegetable hit back' is the wordplay.
'vegetable' becomes 'pea' (pea is a kind of vegetable).
'hit' becomes 'stun' (stunning is a kind of hitting**).
'back' is a reversal indicator.
'stun' reversed gives 'nuts'.
'pea'+'nuts'='PEANUTS'
'in' acts as a link.
(Other definitions for peanuts that I've seen before include "Chickenfeed" , "Not much money - from low-growing plant" , "Very small amount of money" , "Schulz comic strip" , "Popular edible seed pods" .)